I imported 3D models that was ripped from game file(model-resource), but it has black things around eyes and mouth
It seems to be a case of transparent parts rendered as black (this is not a bug, but a feature in material view)

You are in material-view mode and not render mode. When you go into render-mode it should appear correct (if nodes are setup properly).

If nodes are incorrect, It normally is the following:

Its possibly that the alpha output of the image-texture is not connected to the alpha of your principled bsdf.
Edit: As I suspected, the nodes are not properly setup. All you have to do is connect the 'Alpha' output from image texture to 'Alpha' input of Principled BSDF
Note: in the first image below, on the right side, it mistyped &quot;Rendered View&quot;. I meant to say 'Material View/Viewport Shading mode'. Its a small mistake, I noticed late.